What is the hoop effect

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                  What is the hoop effect

                  date:[2019-03-28]     pk_hits:
                  測定混凝土立方體試件抗壓強度,也可以按粗骨料大粒徑的尺寸而選用不同試件的尺寸。
                  但是試件尺寸不同、形狀不同,會影響試件的抗壓強度測定結果。
                  因為混凝土試件在壓力機上受壓時,在沿加荷方向發生縱向變形的同時,也按泊松比效應產生橫向膨脹。而鋼制壓板的橫向膨脹較混凝土小,因而在壓板與混凝土試件受壓面形成摩擦力,對試件的橫向膨脹起著約束作用,這種約束作用稱為"環箍效應"
                  環箍
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